This approach is quite error-prone. Here's an alternative approach: https://github.com/onigoetz/docker-events-stats

A small program that listens on an address or socket and redirects to a Docker Socket.

It prints information when a Docker Container is created or an image is pulled. (soon with push to InfluxDB)

go run main.go -listen localhost:9000 -target unix:/var/run/docker.sock
DOCKER_HOST=tcp://localhost:9000

go run main.go -listen unix:./listen.sock -target unix:/var/run/docker.sock

go run main.go -listen unix:/tmp/listen.sock -target localhost:9001

DOCKER_HOST=tcp://localhost:9000
docker run -it --rm hello-world

Set DOCKER_HOST to the "listen" address of the proxy, it will print the container creations and image pulls.